/Engine/Source/Runtime/SlateCore/Public/Rendering/SlateRenderer.h
Construct the font services from the font caches (we'll create corresponding measure services ourselves) These pointers may be the same if your renderer doesn't need a separate render thread font cache
FSlateFontServices ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< class [FSlateFontCache](API\Runtime\SlateCore\Fonts\FSlateFontCache) > InGameThreadFontCache, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< class [FSlateFontCache](API\Runtime\SlateCore\Fonts\FSlateFontCache) > InRenderThreadFontCache )